Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 850mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ80 mm
- Stroke850 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S
The AirTAC SAIJ80X850-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 2513N push force at 0.5 MPa and features a 25mm SUS304 stainless steel rod. The built-in rear stopper allows you to trim the effective travel, providing a usable stroke window of 775 to 850mm for precise positioning without external stops.
This model includes a magnet for CMSE reed and DMSE electronic sensors, fitting neatly into the dual sensor grooves on the extruded aluminum barrel. It supports a standard speed range of 30-800mm/s and uses a PT G3/8 port. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR options.
Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 850 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×850 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 775-850mm window during commissioning to accommodate different material lengths without adding external mechanical stops.
Product Size Changeovers
Quickly adjust the stroke by up to 75mm on packaging or sorting lines to handle varying box sizes, ensuring precise push-off distances on the fly.
Long-Stroke Machine Setup
Leverage the 2513N push force and fine-tune the end position on large transfer arms, ensuring the 850mm travel terminates exactly at the required datum.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S the Right Cylinder?
Choose this 80mm bore when you need higher thrust than a 63mm cylinder (which provides 1559N push at 0.5 MPa) but want to avoid the bulk of a 100mm bore. The 75mm adjustment range is perfect for machine setups requiring variable end-stops during product changeovers, saving the effort of physically swapping out a fixed-stroke SAI cylinder. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding, consider an external rod lock or the SAIL/BSAI series.
Because this cylinder features a long 850mm stroke, the 25mm SUS304 rod and M20x1.5 rod thread will still experience side-loading if the load is unsupported. Always guide the load externally to prevent binding. For a direct ISO 15552 replacement, match the 80mm bore, 850mm stroke, 75mm adjustment, PT G3/8 port, and the -S magnet requirement.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ80 Adjustable Cylinder SAIJ80BX850-75S FAQ
At 0.5 MPa operating pressure, this 80mm bore cylinder provides 2513N of push force and 2268N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 513 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the nominal 850mm stroke by up to 75mm. This creates a usable travel window of 775 to 850mm, which can be fine-tuned during setup. Note that this stopper does not lock the load without continuous air pressure.
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